If a family of projects has a Commons project, typically the file is uploaded on Commons. The image page there gives copyright info.

In the internal image syntax [[Image:filename]], [[:Image:filename]], or [[Media:filename]], the filename is assumed to refer to the one in the same project if it exists there, otherwise to one on Commons. When choosing a name for a file on Commons, do not use a name that is already in use on any project on which the file may be used, unless the new file should replace the local ones, which will therefore be deleted, or unless the image from Commons should be replaced locally with a local version without changing the links.

An image on Commons can have a separate image page on every project that does not have another image with the same name (which would block access to the image on Commons).

The image is linked to the local image description page, which, due to the contents of MediaWiki:Sharedupload, is linked to the one on Commons, where the image was uploaded. See a few local contents of [[MediaWiki:Sharedupload]]: Meta-wiki, English, and Italian (Note that the link from the called contents to Commons cannot lead to a real image).

To find out on which pages of which projects an image on Commons is used, it is important to link the image page on Commons to all local image pages of that image. Even if the local image page has never been created explicitly and has therefore an empty editable part, a link to the page produces a page with an "image links" section showing the local pages that use the image.

To make a link to the image description page of a sound file, or of an image without including the actual image, use a link like: [[:Image:a_sound.ogg]] or [[:Image:an_image.jpg]]. In the case of an image, the leading colon prevents the image being embedded in the article, and instead makes an ordinary link. In the case of a sound, automatically playing the sound is not possible anyway.

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified image.

The following are the names of the headers in the file skins/monobook/main.css:

filetoc -- Table of contents box above the image.

filehistory -- "File history" header

filelinks -- "Links" header

metadata -- "Metadata" header

siteSub -- ???

contentSub -- ???

The following is the code for certain sections of an Image Page, found at skins/monobook/main.css:

For an image on Commons, the following is shown in addition on the local image page. If the projects are distinguished by language, then the local image page can contain info about the image in the local language. It also allows categorizing the image within the local category system, and shows the local pages that use the image (see e.g. Image:Tst.png).

the rendering of the editable content on Commons, including content transcluded from other pages on Commons; sections are not numbered and not in the TOC; category tags are ignored; internal links within Commons are rendered in the style of internal links, but link to Commons; existence detection with regard to existence on Commons works; variables depending on the site refer to Commons; with regard to noinclude and includeonly tags this is not considered transclusion; avoid specifying an absolute position in the wikitext of the Commons page, as it may interfere with the lay-out of the corresponding local image pages.

The image associated with USS ARIZONA (BB 39) is incorrectly annotated as being "UNDERWAY" while instead it should read "at anchor". File:Arizona (BB39) Port Bow, Underway, 1930 - NARA 5900075 - Edit.jpg The anchor chain is clearly entering the waterline and the Captain's Gig (boat) is abrest the vessel. These two conditions would not be possible if underway. CAPTAIN G.A. HIGGINS, USN, RET

In the description part of the page you can put text. Initially the description part automatically contains the upload summary supplied by the user when uploading the first version (this text also shows up in the Image history section at the first upload line).

What follows refers to images in particular. For sound files, see also w:Wikipedia:Media.

Eg: "Image of a goldfish in a small tank". This should not be an alternative text (see alternative text for images), but rather a description. This is useful for users who do not have direct access to the image, and is a temporary substitute for a proper longdesc tag.

By adding a category tag on the image page, images can be in the same category as other pages, but are treated separately: on the category page they are not included in the count of articles in the category, and they are displayed in a separate section, with a thumbnail and the name for each, see category page.

On Commons there are essentially only images. On projects with real articles, a category can either mix articles and images about a subject, or one has separate image categories. An image category is typically a subcategory of the general category about the same subject, and a subcategory of a wider image category.

For categorizing a new image, the image page does not even have to be edited: the category tag can simply be put in the upload summary.

↑Called 'filetoc', this table of contents is found at skins/monobook/main.css and can be overridden by MediaWiki:Monobook.css

↑In the case of an image proper the image page shows the full image (elsewhere often only a reduced version is shown), or, depending on preferences, a reduced version with a link to the full version, labeled "Download high resolution version (..x.., .. KB)".